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A sandwich-like nano-micro LDH-MXene-LDH for high-performance supercapacitors.
- Source :
-
Applied Surface Science . Jun2020, Vol. 515, pN.PAG-N.PAG. 1p. - Publication Year :
- 2020
-
Abstract
- • The band structure and density of states indicates a high electron transfer. • The structure integrates macroporous structure and stable interconnection. • The supercapacitor gains a good rate retention and long-term cycling stability. The sandwich‐like nano-micro LDH-MXene-LDH is synthesized by the coprecipitation method. The design of MXene@Ni-Mn LDH is estimated by the band structure and partial density of states using density functional theory. MXene as a carrier can promote the electron conductivity of Ni-Mn LDH to improve the rate retention. LDH can uniformly cover MXene surface to provide more available active sites for the capacitance enhancement. The electronic coupling between Ni-Mn LDH and MXene can improve the electron transfer and ensure the structure stability for the long-term cycling. As a three-electrode cell, MXene@Ni-Mn LDH exhibits the enhanced capacitance and rate retention by the synergistic effect. The asymmetric supercapacitor gains the energy density of 44.7 Wh kg−1 at the power density of 800 W kg−1 and maintained the 90.3% of the initial capacitance after 5000 cycles. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 01694332
- Volume :
- 515
- Database :
- Academic Search Index
- Journal :
- Applied Surface Science
- Publication Type :
- Academic Journal
- Accession number :
- 142614544
- Full Text :
- https://doi.org/10.1016/j.apsusc.2020.145982